/*
 * 文件名：MyAccessDecisionManager.java
 * 版权：Copyright by www.wootide.com
 * 描述：
 * 修改人：wuliquan
 * 修改时间：2013-6-23
 * 跟踪单号：
 * 修改单号：
 * 修改内容：
 */
package com.wootide.ets.sys.security.support;

import java.util.Collection;
import java.util.Iterator;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;

public class MyAccessDecisionManager implements AccessDecisionManager {
    
    public void decide(Authentication authentication, Object object, Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
        if(configAttributes == null) {
            return;
        }
        //所请求的资源拥有的权限(一个资源对多个权限)
        Iterator<ConfigAttribute> iterator = configAttributes.iterator();
        while(iterator.hasNext()) {
            ConfigAttribute configAttribute = iterator.next();
            //访问所请求资源所需要的权限
            String needPermission = configAttribute.getAttribute();
            System.out.println("needPermission is " + needPermission);
            //用户所拥有的权限authentication
            for(GrantedAuthority ga : authentication.getAuthorities()) {
                if(needPermission.equals(ga.getAuthority())) {  //ga is user's role.
                    return;
                }
            }
        }
        //没有权限
        throw new AccessDeniedException(" 没有权限访问！ ");
    }

    public boolean supports(ConfigAttribute attribute) {
        return true;
    }

    public boolean supports(Class<?> clazz) {
        return true;
    }
    
}



//public class MyAccessDecisionManager implements AccessDecisionManager
//{
//    
//    //In this method, need to compare authentication with configAttributes.
//    // 1, A object is a URL, a filter was find permission configuration by this URL, and pass to here.
//    // 2, Check authentication has attribute in permission configuration (configAttributes)
//    // 3, If not match corresponding authentication, throw a AccessDeniedException.
//    public void decide(Authentication authentication, Object object,
//            Collection<ConfigAttribute> configAttributes)
//            throws AccessDeniedException, InsufficientAuthenticationException {
//        if(configAttributes == null){
//            return ;
//        }
//        System.out.println(object.toString());  //object is a URL.
//        Iterator<ConfigAttribute> ite=configAttributes.iterator();
//        while(ite.hasNext()){
//            ConfigAttribute ca=ite.next();
//            String needRole=((SecurityConfig)ca).getAttribute();
//            for(GrantedAuthority ga:authentication.getAuthorities()){
//                if(needRole.equals(ga.getAuthority())){  
//                    return;
//                }
//            }
//        }
//        throw new AccessDeniedException("no right");
